PHP - I Don't See What Is Wrong With This Array Read

<?php
ini_set('display_errors', 0);
function escapeArray($array)
{
        foreach ($array as $key => $val)
        {
			if(is_array($val)){
				$array[$key]=escapeArray($val);
			}
			else{
				$array[$key]=addslashes($val);
			}
        }

        return $array;
		
}





$request_type=$_SERVER['REQUEST_METHOD'];
$api_key=$_SERVER['HTTP_X_API_KEY'];
$res=array();
if($api_key!=="643256432"){
	$res['msg']="Failu Invalid API KEY";
	echo json_encode($res);
	die;
}
// Connects to the orcl service (i.e. database) on the "localhost" machine
//$conn = oci_connect('SCOTT', 'admin123', 'localhost/orcl');

$conn = oci_connect('test', 'test', '192.168.10.43/test.test.com');

if (!$conn) {
    $e = oci_error();
    trigger_error(htmlentities($e['message'], ENT_QUOTES), E_USER_ERROR);
}

$request=file_get_contents("php://input");
$request=escapeArray(json_decode($request,true));

 print_r($request);
// die;
if($request_type=="POST"){//for creation of invoice


echo	$CONTACT_ID=isset($request['CONTACT_ID'])?$request['CONTACT_ID']:"";
	$INV_SERIAL_NO=isset($request['INV_SERIAL_NO'])?$request['INV_SERIAL_NO']:"";
	$NAME=isset($request['NAME'])?$request['NAME']:"";
	$INV_DATE=isset($request['INV_DATE'])?$request['INV_DATE']:"";
	$DUE_DATE=isset($request['DUE_DATE'])?$request['DUE_DATE']:"";
	$CURRENCY=isset($request['CURRENCY'])?$request['CURRENCY']:"";
	$SUBTOTAL=isset($request['SUBTOTAL'])?$request['SUBTOTAL']:"";
	$TAX_TOTAL=isset($request['TAX_TOTAL'])?$request['TAX_TOTAL']:"";

echo $SHIP_SERIAL_NO=isset($request['SHIP_SERIAL_NO'])?$request['SHIP_SERIAL_NO']:"";
	$MASTER_NO=isset($request['MASTER_NO'])?$request['MASTER_NO']:"";
	$HOUSE_NO=isset($request['HOUSE_NO'])?$request['HOUSE_NO']:"";
	$shipment_data=isset($request['shipment_data'])?$request['shipment_data']:"";

	if($CONTACT_ID==""){
		$res['msg']="CONTACT_ID is required";
	}
	else if($INV_SERIAL_NO==""){
		$res['msg']="INV_SERIAL_NO is required";
	}
	else if($NAME==""){
		$res['msg']="NAME is required";
	}
	else if($INV_DATE==""){
		$res['msg']="INV_DATE is required";
	}
	else if($DUE_DATE==""){
		$res['msg']="DUE_DATE is required";
	}
	else if($CURRENCY==""){
		$res['msg']="CURRENCY is required";
	}
	else if($SUBTOTAL==""){
		$res['msg']="SUBTOTAL is required";
	}
	else if($TAX_TOTAL==""){
		$res['msg']="TAX_TOTAL is required";
	}

	
	else if($MASTER_NO==""){
		$res['msg']="MASTER_NO is required";
	}
	else if($HOUSE_NO==""){
		$res['msg']="HOUSE_NO is required";
	}
	else if($SHIP_SERIAL_NO==""){
		$res['msg']="SHIP_SERIAL_NO is required";
	}



	

	else{
		$stid = oci_parse($conn, "Select * from FL_HDR_INVOICE where CONTACT_ID='$CONTACT_ID'");
		(oci_execute($stid));
		oci_fetch_all($stid, $out);
		
		

		if(count($out['CONTACT_ID'])==0){

			$stid = oci_parse($conn, "Insert into FL_HDR_INVOICE (CONTACT_ID,INV_SERIAL_NO,NAME,INV_DATE,DUE_DATE,CURRENCY,SUBTOTAL,TAX_TOTAL) Values ('$CONTACT_ID','$INV_SERIAL_NO','$NAME',TO_DATE('$INV_DATE','YYYY-MM-DD'),TO_DATE('$DUE_DATE','YYYY-MM-DD'),'$CURRENCY','$SUBTOTAL','$TAX_TOTAL')");
			oci_execute($stid);

			$stid_2 = oci_parse($conn, "Insert into FL_SHIPMENT_DATA (CONTACT_ID,INV_SERIAL_NO,SHIP_SERIAL_NO,MASTER_NO,HOUSE_NO) Values ('$CONTACT_ID','$INV_SERIAL_NO','$SHIP_SERIAL_NO','$MASTER_NO','$HOUSE_NO')");
			oci_execute($stid_2);



			if(oci_num_rows($stid)>0){
				$res['msg']="Invoice created successfully against this contact_id:".$CONTACT_ID;
			}
			else{
				$res['msg']="Something going wrong please try again later";
				
			}
		}
		else{
			$res['msg']="contact_id must be unique";
		}
	}
	echo json_encode($res);
	die;
}

I need to read json data inside an array. Please help correct my code.. i am trying to do an API.

Hello together,

I'm still relatively new with PHP and I'm encountering an error with the error code (Warning: Undefined array key "title" in I:\xampp\htdocs\test\Datenspeichern.php on line 13 to 17.).

Normally I wanted that when I enter the data in the fields from the CD_Website page, that it is inserted in my created database and displayed in the table on the page. 

Does anyone know where my error is? 

Thanks a lot

main Code=

<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>Unbenanntes Dokument</title>
<style type="text/css">
table {
        border-collaps: collapse;
        width: 100%;
        font-family: serif;
        font-size: 35px;
        text-align: center;
        
    
}

td {
        font-size: 25px;
        text-align: center;
        font-family: serif;
}


</style>
</head>
<body>
<table>
    <tr>
        <th>CD-Titel</th>
        <th>Artist</th>
        <th>Songtitel</th>
        <th>Musiklänge</th>
        <th>Lied Nummer</th>
        </tr>
        
    
        
<?php                                                             

    $host = "localhost";
    $user = "root";
    $password = "";
    $db_name = "cdaufgabe";

    $con = mysqli_connect($host, $user, $password, $db_name);
    if(mysqli_connect_error()) {
        die("Verbindungsabbruch mit der Datenbank: ". mysqli_connect_error());
      };

    $check = "SELECT * FROM `cd-titel`";
    $result = mysqli_query($con, $check);
    
    if ($result > null) {
    while ($row = $result->fetch_assoc()){
    echo "<tr><td>" . $row['CD-Titel'] . "</td> <td>" . $row['Artist'] . "</td> <td>" . $row['Songtitel'] . "</td> <td>" . $row['Musiklänge'] . "</td> <td>" . $row['Lied-Nummer'] . "</td></tr>";
    };        
    };
    
    
    
    /*if (isset($_POST['submitted'])) {
            
    
    $titel = $_POST['titel'];
    $artist = $_POST['artist'];
    $songtitel = $_POST['songtitel'];
    $musicle = $_POST['musicle'];
    $liednr = $_POST['liednr'];
    $data_add =  "INSERT INTO cd-titel (CD-Titel, Artist, Songtitel, Musiklänge, Lied-Nummer) VALUES ('$titel', '$artist', '$songtitel', '$musicle', '$liednr')";
    
    if (!mysqli_query($db_name, $data_add)) {
        die('Fehler beim einfügen von Daten');
    }
        

}
*/
// $data_add =  "INSERT INTO `cd-titel` (`CD-Titel`, `Artist`, `Songtitel`, `Musiklänge`, `Lied-Nummer`) VALUES ('$titel', '$artist', '$songtitel', '$musicle', '$liednr')";
// mysqli_query($con, $data_add);    
    
    
    /*mysqli_query($con, $data_add);*/
    

?>

<form methode="post" action="Datenspeichern.php"> 
            <input type="text" name="titel" placeholder="CD-Titel"/>
            <input type="text" name="artist" placeholder="Artist"/>
            <input type="text" name="songtitel" placeholder="Songtitel"/>
            <input type="text" name="musicle" placeholder="Musiklänge"/>
            <input type="text" name="liednr" placeholder="Lied-Nummer"/> 
             <input type="submit" name="submitted" value="speichern"/>
    </form>
    </br></br></br>
    </table>

</body>
</html>

second code(Datenspeichern.php)=

<?php                                                             
$con = mysqli_connect('localhost', 'root', '');
 if (!$con) {
     echo'Nicht verfügbar';
 }
 
 if (!mysqli_select_db($con, 'cdaufgabe')){
 
        echo 'Datenbank nicht ausgewählt';
        
 };
 
    $titel = $_POST['titel'];
    $artist = $_POST['artist'];
    $songtitel = $_POST['songtitel'];
    $musicle = $_POST['musicle'];
    $liednr = $_POST['liednr'];
 
 
    $data_add =  "INSERT INTO cd-titel (CD-Titel, Artist, Songtitel, Musiklänge, Lied-Nummer) VALUES ('$titel', '$artist', '$songtitel', '$musicle', '$liednr')";
    
 if (!mysqli_query($con, $data_add)){
     echo 'Fehler';
     
 }
 
 else {
     echo'Eingefügt';
 };
 
 
 
 header("url=CD_Webseite.php");
 
?>

Does anyone knows the mistake i keep doing?